lecture 20 - standing waves, resonance

# lecture 20 - standing waves, resonance - Announcements...

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Announcements 2/22/11 Prayer Dispersion lab due tonight I will have office hours today

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Interference Path length a. Constructive b. Destructive Demo: Moire pattern  transparencies  Video: Two outdoor speakers  Ripple Tank image: wikipedia
Reading Quiz In a standing wave, the points that have the  maximum vibration are called: a. nodes b. antinodes

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Standing Waves Demo: Rubber tubing Image from Wikipedia
Standing Waves Will occur whenever you have two waves (same  frequency, wavelength) moving in opposite directions Math:   A cos(kx -  ϖ t)  +  A cos(kx +  ϖ t)   From trig.: cos(a–b) + cos(a+b) = 2cos(a)cos(b) Can occur via refletions of a single wave! But timing  over again Web demo, revisited  http://www.colorado.edu/physics/phet/simulations/stringwave/stringWave.swf   Image by Colton

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lecture 20 - standing waves, resonance - Announcements...

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